“So what’s going on with autism?” wondered US President, Donald Trump, in a recent discussion with educators at the White House. “When you look at the tremendous increase, it’s really – it’s such an incredible – it’s really a horrible thing to watch, the tremendous amount of increase.” Is President Trump right? Is there a tremendous increase in the prevalence of autism?
Knowing the true number of people with autism is so fraught with difficulty that any bold statements about prevalence should be treated with caution. The fact that every time a diagnostic manual has a new edition

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